How do you use Time Machine with more then one mac

I just bought a new external hard drive and want to back up my iMac & MacBook Pro using Time Machine. But I do not want to use my airport network.
I will keep the hard drive connected to the iMac, but want to, as needed, plug my MacBook Pro into the Hard drive to back up.
Is this possible? Do I have first partition the new backup hard drive?
Any help is appreciated... Jim

Ok... I am back again.
I decided to plug my backup drive into the USB port on the Airport extreme.
On my Macbook Pro, which I connect wirelessly, I was able to start Time Machine... Time Machine saw the backup drive and did a backup.. Yes it took a long time Anyway all is cool with that.
My iMac is connected to the Airport Extreme by Ethernet. On the iMac when I started Time Machine, it does not see the backup hard drive. I can see and share the hard drive... works fine. But no luck with TM seeing the hard drive on the iMac.
Questions is will Time Machine work with a computer that is connected to airport extreme by ethernet. If yes how o you set it up and what might be wrong??
I might mention that the reason I have the iMac connected with an ethernet cable and not wirelessly is because the iMac does not stay connected well to the internet and when it is connected has a very slow connection. My MacBook Pro is all the way across the house and has a great connection.
I have guessed the slow connection was because the Airport Extreme sits right next to the iMac and maybe there is some kind of interference.
Thanks.... any help is appreciated.

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